Back plate assembly and backlight module

ABSTRACT

A back plate assembly and a backlight module are provided. The back plate assembly includes a back plate, at least one optical film and at least one fixing member. The back plate includes a bottom plate and a sidewall. The optical film is disposed on the bottom plate. The fixing member includes a main body and a protruding member. At least one portion of the main body overlaps with the sidewall. The protruding member is disposed on the main body and is combined with the optical film.

RELATED APPLICATIONS

This application claims priority to Taiwan Application Serial Number103118131, filed May 23, 2014, which is herein incorporated byreference.

BACKGROUND

1. Field of Invention

The present invention relates to a light source assembly. Moreparticularly, the present invention relates to a back plate assembly anda backlight module.

2. Description of Related Art

Referring to FIG. 1A, FIG. 1A is a schematic structural diagram showinga conventional back plate and a block. In a conventional backlightmodule, for securing optical films, a block 920 is disposed in the backplate 910. A pillar 920 a is disposed on the block 920 for engaging withthe optical films. However, because the strength of the block 920 ispoor, the pillar 920 a is easily to be broken and fails to fix theoptical films effectively. In addition, the block 920 itself has acertain thickness, which is disadvantageous to the narrow frame designof the backlight module.

Simultaneously referring to FIG. 1B, FIG. 1B is a schematic structuraldiagram showing a conventional back plate and a positioning post.Another way to fix the optical films is to dispose a positioning post940 on the back plate 930. Before the positioning post 940 is disposed,plural through holes 930 a have to be disposed on the back plate 930.Therefore, the positioning post 940 can pass through the through hole930 a to be fixed on the back plate 930. Although the positioning post940 occupies a space smaller than the block 920, yet when being formedon the back plate 930, the through holes 930 a for mounting thepositioning post 940 have to be spaced at a distance from an edge of theback plate 930 due to the limitation of the processing technique.Therefore, it is disadvantageous to shrinking the frame width of thebacklight module. In addition, the through hole 930 a disposed on theback plate 930 will seriously affect the appearance of the back plate930.

SUMMARY

One object of the present invention is to provide a back plate assemblyand a backlight module, in which a fixing member having a guiding grooveand a fixing portion is used to fix an optical film and a light guideplate on a back plate. Moreover, a slot corresponding to the fixingportion is disposed on the back plate. Therefore, when the fixing memberis disposed on the back plate, a sidewall of the back plate can be fixedin the guiding groove, and the fixing portion can fill in the space ofthe slot, so as to achieve an effect of saving the space and increasingthe strength of the back plate.

Another object of the present invention is to provide a back plateassembly and a backlight module, the injection molding manner is used toform the fixing member of the present invention for combining aprotruding member having higher strength with a main body, so as toincrease the overall strength of the fixing member and the reliabilityof the optical film disposed on the fixing member.

According to the aforementioned objects, a back plate assembly isprovided. The back plate assembly includes a back plate, at least oneoptical film and at least one fixing member. The back plate includes abottom plate and a sidewall. The optical film is disposed on the bottomplate. The fixing member includes a main body and a protruding member.At least one portion of the main body overlaps with the sidewall. Theprotruding member is disposed on the main body and is combined with theoptical film.

According to the aforementioned objects, another back plate assembly isprovided. The back plate assembly includes a back plate, at least oneoptical film and at least one fixing member. The back plate includes abottom plate and a sidewall. The optical film is disposed on the bottomplate. The fixing member includes a main body and a protruding member.The main body is disposed between the sidewall and the optical film. Theprotruding member is disposed on the main body and is combined with theoptical film.

According to an embodiment of the present invention, the fixing memberis movable along a direction towards the bottom plate so as to becombined with the bottom plate, and the protruding member of the fixingmember extends along a direction away from the bottom plate so as to becombined with the optical film.

According to an embodiment of the present invention, the protrudingmember has a length and a width, and an extending direction of thelength is parallel to an extending direction of the sidewall.

According to an embodiment of the present invention, the optical filmhas a through hole with a length, in which an extending direction of thelength of the through hole is parallel to the extending direction of thelength of the protruding member.

According to an embodiment of the present invention, the through hole ofthe optical film has a width, and the width of the through hole isgreater than the width of the protruding member.

According to an embodiment of the present invention, the protrudingmember is a metal plate, and the main body is combined with theprotruding member by an injection molding manner.

According to an embodiment of the present invention, the sidewall of theback plate is connected to the bottom plate of the back plate, and atleast one slot is disposed on the bottom plate or the sidewall of theback plate, in which the main body has a guiding groove and at least onefixing portion, the sidewall is fixed in the guiding groove, and thefixing portion is fixed in the slot.

According to an embodiment of the present invention, the main bodyincludes a top surface, a bottom surface and a side surface. Theprotruding member protrudes from the top surface. The bottom surface isopposite to the top surface, in which the fixing portion protrudes fromthe bottom surface, and the slot of the back plate is disposed on thebottom plate corresponding to the fixing portion. The side surfaceconnecting the top surface to the bottom surface, in which the guidinggroove is a recess portion formed at the side surface

According to an embodiment of the present invention, the main bodyincludes a projection disposed on the top surface.

According to an embodiment of the present invention, the main bodyincludes an inserting member disposed on bottom surface, and theinserting member is correspondingly inserted into an insert hole on thebottom plate.

According to an embodiment of the present invention, the main bodyincludes a top surface and a first side surface. The protruding memberprotrudes from the top surface. A first side surface is connected to thetop surface. At least one fixing portion and an extending portionrespectively protrudes from the first side surface, in the slot of theback plate is disposed on the sidewall corresponding to the fixingportion, and the guiding groove is formed at the extending portion.

According to an embodiment of the present invention, the slot of theback plate includes a positioning portion and a taper portion connectedto the positioning portion, and the fixing portion is elastic anddeformable by being compressed by the taper portion, so as to be fixedin the positioning portion by a resilient recovery force.

According to the aforementioned objects, a back plate assembly isprovided. The back plate assembly includes the aforementioned back plateassembly, a light guide plate and a light source. The light guide plateis disposed between the bottom plate and the optical film, in which thelight guide plate includes at least one flange lug extending from a sideedge of the light guide plate, and the flange lug is staggered arrangedwith the protruding member. The light source disposed is adjacent to alight-incident surface of the light guide plate.

According to the aforementioned objects, another back plate assembly isprovided. The back plate assembly includes the aforementioned back plateassembly, a light guide plate and a light source. The light guide plateis disposed between the bottom plate and the optical film, in which thelight guide plate abuts against the main body. The light source disposedis adjacent to a light-incident surface of the light guide plate.

It is to be understood that both the foregoing general description andthe following detailed description are by examples, and are intended toprovide further explanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention can be more fully understood by reading the followingdetailed description of the embodiment, with reference made to theaccompanying drawings as follows:

FIG. 1A is a schematic structural diagram showing a conventional backplate and a block;

FIG. 1B is a schematic structural diagram showing a conventional backplate and a positioning post;

FIG. 2 is a schematic structural diagram showing a partial enlargementof a backlight module in accordance with a first embodiment of thepresent invention;

FIG. 3A is a schematic exploded view showing the backlight module inaccordance with the first embodiment of the present invention;

FIG. 3B is a schematic structural diagram showing a partial enlargementof FIG. 3A;

FIG. 4 is a schematic exploded view showing a fixing member and a backplate in accordance with the first embodiment of the present invention;

FIG. 5 is an assembling view showing the fixing member and the backplate in accordance with the first embodiment of the present invention;

FIG. 6 is another schematic exploded view showing the fixing member andthe back plate in accordance with the first embodiment of the presentinvention;

FIG. 7 is a schematic cross-sectional view showing the fixing member inaccordance with the first embodiment of the present invention;

FIG. 8 is a schematic cross-sectional view showing the backlight modulein accordance with the first embodiment of the present invention;

FIG. 9 is a schematic top view showing the backlight module inaccordance with the first embodiment of the present invention;

FIG. 10A is a schematic exploded view showing a backlight module inaccordance with a second embodiment of the present invention;

FIG. 10B is a schematic structural diagram showing a partial enlargementof FIG. 10A;

FIG. 11 is an assembling view showing the fixing member and the backplate in accordance with the second embodiment of the present invention;

FIG. 12 is a schematic cross-sectional view showing the backlight modulein accordance with the second embodiment of the present invention; and

FIG. 13 is a schematic top view showing the backlight module inaccordance with the second embodiment of the present invention.

DETAILED DESCRIPTION

Reference will now be made in detail to the present embodiments of theinvention, examples of which are illustrated in the accompanyingdrawings. Wherever possible, the same reference numbers are used in thedrawings and the description to refer to the same or like parts.

Simultaneously referring to FIG. 2, FIG. 3A and FIG. 3B, FIG. 2 is aschematic structural diagram showing a partial enlargement of abacklight module 100 in accordance with a first embodiment of thepresent invention, FIG. 3A is a schematic exploded view showing thebacklight module 100 in accordance with the first embodiment of thepresent invention, and FIG. 3B is a schematic structural diagram showinga partial enlargement of FIG. 3A. In the present embodiment, thebacklight module 100 mainly includes a back plate assembly 200, a lightguide plate 300, a light source 102 and a reflecting film 400. As shownin FIG. 2, the light source 102 is disposed adjacent to a light-incidentsurface 300 a of the light guide plate 300, in which the light source102 includes a plurality of light emitting diodes 103 assembled on aprinted circuit board (PCB). As shown in FIG. 3B, the back plateassembly 200 includes a back plate 220, at least one optical film 240and at least one fixing member 260. The back plate 220 includes a bottomplate 222 and sidewalls 223 and 224 connected to the bottom plate 222,in which the sidewall 224 is used to combine with the fixing member 260.Moreover, the reflecting film 400, the light guide plate 300 and theoptical film 240 are sequentially disposed on the bottom plate 222. Thefixing member 260 is used to limit the light guide plate 300 and thereflecting film 400 and to fix the optical film 240 on the back plate220. In some embodiments, the back plate 220 is rectangular and has foursides, such as two opposite long sides and two opposite short sides. Thelight source 102 is disposed on one of the long sides of the back plate220, and the fixing member 260 can be disposed on the other long sideor/and the short sides.

Simultaneously referring to FIG. 4 and FIG. 5, FIG. 4 and FIG. 5 are aschematic exploded view and an assembling view showing the fixing member260 and the back plate 220 in accordance with the first embodiment ofthe present invention. The fixing member 260 includes a main body 262and a protruding member 264. As shown in FIG. 4, the main body 262includes a top surface 262 a, a bottom surface 262 b and a side surface262 c. The bottom surface 262 b is opposite to the top surface 262 a,and the side surface 262 c connects the top surface 262 a to the bottomsurface 262 b. In addition, the main body 262 has a guiding groove 262 dand at least one fixing portion 262 e. The guiding groove 262 d is arecess portion formed at the side surface 262 c the main body 262.Therefore, when being fixed on the back plate 220, the fixing member 260is moved along a direction D1 towards the bottom plate 222, so that thesidewall 224 can slide along the guiding groove 262 d to be fixed in theguiding groove 262 d. In other words, a portion of the main body 262 ofthe fixing member 260 overlaps with the sidewall 224 of the back plate220.

Referring to FIG. 4 and FIG. 5 again, the fixing portion 262 e of themain body 262 protrudes from the bottom surface 262 b of the main body262. A slot 226 is disposed on the bottom plate 222 of the back plate220 corresponding to the fixing potion 262 e. Therefore, the fixingmember 260 can be fixed on the back plate 220 by inserting the fixingpotion 262 e into the slot 226 along the direction D1. In someembodiments, in a process of fabricating the back plate 220, a stampingprocess is performed to form plural slots 226 on a plate. Then, aportion of the plate without the slots 226 near a side edge of the plateis bent upwards to form the sidewalls 223 and 224, in which the otherportion of the plate is defined as the bottom plate 222. Therefore, asshown in FIG. 5, when the fixing member 260 is fixed on the back plate220, the fixing portion 262 e can fill in the space of the slot 226, soas to save the space and increase the strength of the back plate 220. Insome embodiments, when the fixing member 260 is fixed on the back plate220, the main body 262 does not contact the sidewall 223 (as shown inFIG. 5). In other embodiments, when the fixing member 260 is fixed onthe back plate 220, one side or both sides of the main body 262 can abutagainst the sidewall 223 (as shown FIG. 2) to limit the position of thefixing member 260.

Simultaneously referring to FIG. 6, FIG. 6 is another schematic explodedview showing the fixing member 260 and the back plate 220 in accordancewith the first embodiment of the present invention. In some embodiments,the main body 262 includes an inserting member 262 f disposed on thebottom surface 262 b, and the bottom plate 222 includes an insert hole222 a corresponding to the inserting member 262 f. Therefore, the fixingmember 260 can be fixed on the back plate 220 by inserting the insertingmember 262 f into the insert hole 222 a.

Referring to FIG. 4 and FIG. 7, FIG. 7 is a schematic cross-sectionalview showing the fixing member 260 in accordance with the firstembodiment of the present invention. In the present embodiment, theprotruding member 264 is combined with the main body 262 and protrudesfrom the top surface 262 a of the main body 262. In some embodiments,the protruding member 264 is a metal plate or formed from anothermaterial with high strength, such as a SGCC galvanized steel plate or aniron plate. Meanwhile, the main body 262 is formed from polycarbonate(PC). In a process of fabricating the fixing member 260 of the presentembodiment, as shown in FIG. 7, after a through hole 264 a is formed onthe protruding member 264, a gauge is used to fix the protruding member264. Then, an injection molding manner is used to inject a material usedto form the main body 262 into a mold to cover a portion of theprotruding member 264, so as to combined the protruding member 264 withthe main body 262. Meanwhile, in the fabricating process, the materialused to form the main body 262 flows into the through hole 264 a of theprotruding member 264, so as to increase the jointing strength betweenthe protruding member 264 and the main body 262.

Simultaneously referring to FIG. 3B, FIG. 8 and FIG. 9, FIG. 8 and FIG.9 are schematic cross-sectional and top views showing the backlightmodule in accordance with the first embodiment of the present invention.Besides the protruding member 264 of the fixing member 260 can be usedto fix the optical film 240, the fixing member 260 itself also can limitthe light guide plate 300 and the reflecting film 400. As shown in FIG.3B, in one embodiment, the light guide plate 300 has at least one flangelug 302 extending from the side edge of the light guide plate 300. Whenthe light guide plate 300 is disposed on the bottom plate 222, theflange lug 302 is located on the top surface 262 a of the main body 262,and is staggered arranged with the protruding member 264. In otherembodiments, the main body 262 includes a projection 262 g disposed onthe top surface 262 a, and the projection 262 g covers a portion of theprotruding member 264. The light guide plate 300 can be limited by theflange lug 302 abutting against the projection 262 g, so as to preventthe light guide plate 300 from being damaged during transportation. Inaddition, the projection 262 g also can prevent the side edge of thelight guide plate 300 from colliding with the protruding member 264. Inthe present embodiment, the reflecting film 400 is disposed on a bottomsurface of the light guide plate 300 and has the same shape anddimension with the light guide plate 300, so that light emitted to thebottom surface of the light guide plate 300 can be effectivelyreflected.

Referring to FIG. 3B, FIG. 8 and FIG. 9 again, the optical film 240 isdisposed on the reflecting film 400 and the light guide plate 300, andis engaged with the protruding member 264 of the fixing member 260. Inother words, the main body 262 of the fixing member 260 is disposedbetween the sidewall 224 and the optical film 240. In one embodiment,the optical film 240 includes at least one flange lug 242 extending froma side edge of the optical film 240. The flange lug 242 has a throughhole 242 a. Therefore, when the optical film 240 is disposed on thefixing member 260, the protruding member 264 passes through the throughhole 242 a of the flange lug 242.

As shown in FIG. 8 and FIG. 9, in one embodiment, the protruding member264 is a rectangular plate with a length L1 and a width W1. An extendingdirection of the length L1 is parallel to an extending direction D2 ofthe sidewall 224. Moreover, the through hole 242 a of the optical film240 is a rectangular hole with a length L2 and a width W2. An extendingdirection of the length L2 is parallel to the extending direction D2 ofthe sidewall 224, so that the length L2 is parallel to the length L1 ofthe protruding member 264. In addition, the length L2 and the width W2of the through hole 242 a are greater than the length L1 and the widthW1 of the protruding member 264 respectively. In other words, when theoptical film 240 is engaged with the protruding member 264, theprotruding member 264 does not contact the inner wall of the throughhole 242 a, and there is a distance between the protruding member 264and the inner wall of the through hole 242 a. Such distance designprovides tolerance for allowing the optical film 240 to expand therein,so as to prevent the optical film 240 from being limited by the lengthL1 or the width W1 of the protruding member 264 and deformed due to theheat or moisture absorption. The design of the rectangular plate canincrease the an assembling area between the optical film 240 and theprotruding member 264, thus increasing the stability of the optical film240 disposed on the fixing member 260. On the other hand, the design ofthe rectangular plate also can increase the contact area between theprotruding member 264 and the main body 262, thus increasing thejointing strength between the protruding member 264 and the main body262.

In the present invention, the fixing member 260 has various designs.Simultaneously referring to FIG. 10A and FIG. 10B, FIG. 10A is aschematic exploded view showing a backlight module 500 in accordancewith a second embodiment of the present invention, and FIG. 10B is aschematic structural diagram showing a partial enlargement of FIG. 10A.In the present embodiment, the backlight module 500 mainly includes aback plate assembly 600, a light guide plate 700, a light source (notshown) and a reflecting film 800. The disposition of the light source inthe present embodiment is similar to the disposition of the light source102 in FIG. 2, and is not described again herein. As shown in FIG. 10B,the back plate assembly 600 includes a back plate 620, at least oneoptical film 640 and at least one fixing member 660. The back plate 620includes a bottom plate 622 and a sidewall 624 connected to the bottomplate 622. Moreover, the reflecting film 800, the light guide plate 700and the optical film 640 are sequentially disposed on the bottom plate622. Similarly, the fixing member 660 is used to limit the light guideplate 700 and the reflecting film 800 and fix the optical film 640 onthe back plate 620.

Simultaneously referring to FIG. 10B and FIG. 11, FIG. 11 is anassembling view showing the fixing member 660 and the back plate 620 inaccordance with the second embodiment of the present invention. Thefixing member 660 includes a main body 662 and a protruding member 664.As shown in FIG. 10B, the main body 662 includes a top surface 662 a, afirst side surface 662 b and a second side surface 662 c. The first sidesurface 662 b is opposite to the second side surface 662 c, and the topsurface 662 a connects the first side surface 662 b to the second sidesurface 662 c, in which the aforementioned first side surface 662 b is asurface near the sidewall 624 of the back plate 620. As shown in FIG.10B, the main body 662 has a guiding groove 662 d, at least one fixingportion 662 e and an extending portion 662 f. The fixing portion 662 eand the extending portion 662 f are disposed on the main body 662 andprotrude from the first side surface 662 b of the main body 662.Moreover, the guiding groove 662 d is formed at the extending portion662 f. In the present embodiment, an opening of the guiding groove 662 dfaces toward the bottom plate 622 of the back plate 620. Therefore,while being installed on the back plate 620, the fixing member 600 ismoved along a direction D3 towards the bottom plate 622, so that thesidewall 624 can slide along the guiding groove 662 d to be fixed in theguiding groove 662 d. In other words, at least one portion of fixingmember 660 of the main body 662 overlaps with the sidewall 624 of theback plate 620.

Referring to FIG. 10B and FIG. 11, the fixing portion 662 e of the mainbody 662 protrudes from the first side surface 662 b of the main body662. A slot 626 is disposed on the sidewall 624 of back plate 620corresponding to the fixing portion 662 e. The slot 626 includes apositioning portion 626 a and a taper portion 626 b connected to thepositioning portion 626 a. Moreover, the fixing portion 662 e iselastic. Therefore, while the fixing member 660 is being installed onthe back plate 620 along the direction D3, the fixing portion 662 e iscompressed and deformed by the taper portion 626 b, thereby fixing thefixing portion 662 e in the positioning portion 626 a by a resilientrecovery force. In one example, the fixing portion 662 e includes twoconvex posts spaced from each other. While the fixing member 660 isbeing installed on the back plate 620, the two convex posts arecompressed by the taper portion 626 b and moves closer to each other.Then, after being moved to the positioning portion 626 a, the two convexposts return to their original positions by the resilient recoveryforce, so as to be fixed in the positioning portion 626 a. Therefore,the fixing member 660 can be fixed on the back plate 620 by locking thefixing portion 662 e into the slot 626.

In some embodiments, in a process of fabricating the back plate 620, astamping process is used to form plural slots 626 on a plate. Then, aportion of the plate disposed with the slots 626 near a side edge of theplate is bent upwards to form the sidewall 624, in which the otherportion of the plate is defined as the bottom plate 622. Therefore, asshown in FIG. 11, when the fixing member 660 is fixed on the back plate620, the fixing portion 662 e can fill in the space of the slot 626, soas to save the space and increase the strength of the back plate 620.

As shown in FIG. 11, in the present embodiment, the protruding member664 is combined with the main body 662 and protrudes from the topsurface 662 a of the main body 662. It is noted that the material andthe process for forming the fixing member 660 of the present embodimentare similar to the aforementioned fixing member 260, and are notdescribed again herein.

Referring to FIG. 10B, FIG. 12 and FIG. 13, FIG. 12 and FIG. 13 areschematic cross-sectional and top views showing the backlight module inaccordance with the second embodiment of the present invention. Besidesthe protruding member 664 of the fixing member 660 can be used to fixthe optical film 640, the fixing member 660 itself also can limit thelight guide plate 700 and the reflecting film 800. As shown in FIG. 10B,in one embodiment, when the light guide plate 700 is disposed on thebottom plate 622, a side edge of the light guide plate 700 can abutagainst the second side surface 662 c of the main body 662, so as tolimit the light guide plate 700. In addition, the protruding member 664is combined with the main body 662 and protrudes from the top surface662 a of the main body 662, so as to prevent the side edge of the lightguide plate 700 from colliding with the protruding member 264. In thepresent embodiment, the reflecting film 800 is disposed on a bottomsurface of the light guide plate 700 and has the same shape anddimension with the light guide plate 700, so that light emitted to thebottom surface of the light guide plate 700 can be effectivelyreflected. It is noted that, in order to meet different designrequirements, the light guide plate 700 does not directly contact thesecond side surface 662 c of the main body 662, and there is a distancebetween the second side surface 662 c and the light guide plate 700.

Referring to FIG. 10, FIG. 12 and FIG. 13 again, the optical film 640 isdisposed on the reflecting film 800 and the light guide plate 700, andis engaged with the protruding member 664 of the fixing member 660. Inother words, the main body 662 of the fixing member 660 is disposedbetween the sidewall 624 and the optical film 640. In some embodiments,the optical film 640 includes at least one flange lug 642 extending froma side edge of the optical film 640. The flange lug 642 has a throughhole 642 a. Therefore, when the optical film 640 is disposed on thefixing member 660, the protruding member 664 passes through the throughhole 642 a of the flange lug 642.

As shown in FIG. 12 and FIG. 13, in one embodiment, the protrudingmember 664 is a rectangular plate with a length L3 and a width W3. Anextending direction of the length L3 is parallel to an extendingdirection D4 of the sidewall 624. Moreover, the through hole 642 a ofthe optical film 640 is a rectangular hole with a length L4 and a widthW4. An extending direction of the length L4 is parallel to the extendingdirection D4 of the sidewall 624, so that the length L4 is parallel tothe length L3 of the protruding member 664. In addition, the length L4and the width W4 of the through hole 642 a are greater than the lengthL3 and the width W3 of the protruding member 664 respectively. In otherwords, when the optical film 640 is engaged with the protruding member664, the protruding member 664 does not contact the inner wall of thethrough hole 642 a, and there is a distance between the protrudingmember 664 and the inner wall of the through hole 642 a. Such distancedesign provides tolerance for allowing the optical film 640 to expandtherein, so as to prevent the optical film 640 from being limited by thelength L3 or the width W3 of the protruding member 664 and deformed dueto the heat or moisture absorption. The design of the rectangular platecan increase the assembling area between the optical film 640 and theprotruding member 664, thus increasing stability of the optical film 640disposed on the fixing member 660. On the other hand, the design of therectangular plate also can increase the contact area between theprotruding member 664 and the main body 662, thus increasing thejointing strength between the protruding member 664 and the main body662.

According to the aforementioned embodiments of the present invention,the fixing member having the guiding groove and the fixing portion isused to fix the optical film and the light guide plate on the backplate. Moreover, the slot corresponding to the fixing portion isdisposed on the back plate. Therefore, when the fixing member isdisposed on the back plate, the sidewall of the back plate can be fixedin the guiding groove, and the fixing portion can fill in the space ofthe slot, so as to achieve an effect of saving the space and increasingthe strength of the back plate.

According to the aforementioned embodiments of the present invention, aninjection molding manner is used to form the fixing member of thepresent invention for combining the protruding member having higherstrength with the main body, so as to increase the overall strength ofthe fixing member and the reliability of the optical film disposed onthe fixing member. In addition, the size of the through hole of theoptical film can be designed according to the length and the width ofthe protruding member, so as to provide tolerance for allowing theoptical film to expand therein due to the heat or moisture absorption,and prevent the optical from being deformed by compression.

Although the present invention has been described in considerable detailwith reference to certain embodiments thereof, other embodiments arepossible. Therefore, the spirit and scope of the appended claims shouldnot be limited to the description of the embodiments contained herein.

It will be apparent to those skilled in the art that variousmodifications and variations can be made to the structure of the presentinvention without departing from the scope or spirit of the invention.In view of the foregoing, it is intended that the present inventioncover modifications and variations of this invention provided they fallwithin the scope of the following claims.

What is claimed is:
 1. A back plate assembly, comprising: a back platecomprising a bottom plate and a sidewall; at least one optical filmdisposed on the bottom plate; and at least one fixing member,comprising: a main body, wherein at least one portion of the main bodyoverlaps with the sidewall; and a protruding member which is disposed onthe main body and is combined with the optical film.
 2. The back plateassembly of claim 1, wherein the fixing member is movable along adirection towards the bottom plate so as to be combined with the bottomplate, and the protruding member of the fixing member extends along adirection away from the bottom plate so as to be combined with theoptical film.
 3. The back plate assembly of claim 1, wherein theprotruding member has a length and a width, and an extending directionof the length is parallel to an extending direction of the sidewall. 4.The back plate assembly of claim 3, wherein the optical film has athrough hole with a length, wherein an extending direction of the lengthof the through hole is parallel to the extending direction of the lengthof the protruding member.
 5. The back plate assembly of claim 4, whereinthe through hole of the optical film has a width, and the width of thethrough hole is greater than the width of the protruding member.
 6. Theback plate assembly of claim 1, wherein the protruding member is a metalplate, and the main body is combined with the protruding member by aninjection molding manner.
 7. The back plate assembly of claim 1, whereinthe sidewall of the back plate is connected to the bottom plate of theback plate, and at least one slot is disposed on the bottom plate or thesidewall of the back plate, wherein the main body has a guiding grooveand at least one fixing portion, the sidewall is fixed in the guidinggroove, and the fixing portion is fixed in the slot.
 8. The back plateassembly of claim 7, wherein the main body comprises: a top surface,wherein the protruding member protrudes from the top surface; a bottomsurface opposite to the top surface, wherein the fixing portionprotrudes from the bottom surface, and the slot of the back plate isdisposed on the bottom plate corresponding to the fixing portion; and aside surface connecting the top surface to the bottom surface, whereinthe guiding groove is a recess portion formed at the side surface. 9.The back plate assembly of claim 8, wherein the main body comprises aprojection disposed on the top surface.
 10. The back plate assembly ofclaim 8, wherein the main body comprises an inserting member disposed onbottom surface, and the inserting member is correspondingly insertedinto an insert hole on the bottom plate.
 11. The back plate assembly ofclaim 7, wherein the main body comprises: a top surface, wherein theprotruding member protrudes from the top surface; and a first sidesurface connected to the top surface, at least one fixing portion and anextending portion respectively protruding from the first side surface,wherein the slot of the back plate is disposed on the sidewallcorresponding to the fixing portion, and the guiding groove is formed atthe extending portion.
 12. The back plate assembly of claim 11, whereinthe slot of the back plate comprises a positioning portion and a taperportion connected to the positioning portion, and the fixing portion iselastic and deformable by being compressed by the taper portion, so asto be fixed in the positioning portion by a resilient recovery force.13. A back plate assembly, comprising: a back plate comprising a bottomplate and a sidewall; at least one optical film disposed on the bottomplate; and at least one fixing member, comprising: a main body disposedbetween the sidewall and the optical film; and a protruding member whichis disposed on the main body and is combined with the optical film. 14.The back plate assembly of claim 13, wherein the fixing member ismovable along a direction towards the bottom plate so as to be combinedwith the bottom plate, and the protruding member of the fixing memberextends along a direction away from the bottom plate so as to becombined with the optical film.
 15. The back plate assembly of claim 13,wherein the protruding member has a length and a width, and an extendingdirection of the length is parallel to an extending direction of thesidewall.
 16. The back plate assembly of claim 15, wherein the opticalfilm has a through hole with a length, and an extending direction of thelength of the through hole is parallel to the extending direction of thelength of the protruding member.
 17. The back plate assembly of claim16, wherein the through hole of the optical film has a width, and thewidth is greater than the width of the protruding member.
 18. The backplate assembly of claim 13, wherein the protruding member is a metalplate, and the main body is combined with the protruding member by aninjection molding manner.
 19. The back plate assembly of claim 13,wherein the sidewall of the back plate is connected to the bottom plateof the back plate, and at least one slot is disposed on the bottom plateor the sidewall of the back plate, wherein the main body has a guidinggroove and at least one fixing portion, the sidewall is fixed in theguiding groove, and the fixing portion is fixed in the slot.
 20. Theback plate assembly of claim 19, wherein the main body comprises: a topsurface, wherein the protruding member protrudes from the top surface; abottom surface opposite to the top surface, wherein the fixing portionprotrudes from the bottom surface, and the slot of the back plate isdisposed on the bottom plate corresponding to the fixing portion; and aside surface connecting the top surface to the bottom surface, whereinthe guiding groove is a recess portion formed at the side surface. 21.The back plate assembly of claim 20, wherein the main body comprises aprojection disposed on the top surface.
 22. The back plate assembly ofclaim 8, wherein the main body comprises an inserting member disposed onbottom surface, and the inserting member is correspondingly insertedinto an insert hole on the bottom plate.
 23. The back plate assembly ofclaim 19, wherein the main body comprises: a top surface, wherein theprotruding member protrudes from the top surface; and a first sidesurface connected to the top surface, at least one fixing portion and anextending portion respectively protruding from the first side surface,wherein the slot of the back plate is disposed on the sidewallcorresponding to the fixing portion, and the guiding groove is formed atthe extending portion.
 24. The back plate assembly of claim 23, whereinthe slot of the back plate comprises a positioning portion and a taperportion connected to the positioning portion, and the fixing portion iselastic and deformable by being compressed by the taper portion, so asto be fixed in the positioning portion by a resilient recovery force.25. A backlight module, comprising: a back plate assembly of claim 1; alight guide plate disposed between the bottom plate and the opticalfilm, wherein the light guide plate comprises at least one flange lugextending from a side edge of the light guide plate, and the flange lugis staggered arranged with the protruding member; a light sourcedisposed adjacent to a light-incident surface of the light guide plate.26. A backlight module, comprising: a back plate assembly of claim 1; alight guide plate disposed between the bottom plate and the opticalfilm, wherein the light guide plate abuts against the main body, and alight source disposed adjacent to a light-incident surface of the lightguide plate.